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COMPARISON OF SCREW-IN EFFECT FOR SEVERAL NICKEL-TITANIUM ROTARY INSTRUMENTS IN SIMULATED RESIN ROOT CANAL

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ÇÏÁ¤È« ( Ha Jung-Hong ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
Áø¸í¿í ( Jin Myoung-Uk ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±è¿µ°æ ( Kim Young-Kyung ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±è¼º±³ ( Kim Sung-Kyo ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

Screw-in effect´Â ´ÏÄÌ-ƼŸ´½ Àüµ¿ ÆÄÀÏÀ» »ç¿ëÇÑ ±Ù°üÇü¼º½Ã ³ªÅ¸³ª´Â Çö»óÀ¸·Î ±Ù°üÇü¼ºÀ» ¾î·Æ°Ô ÇÑ´Ù. ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº ´Ù¾çÇÑ ´ÏÄÌ-ƼŸ´½ Àüµ¿ ÆÄÀÏµé »çÀÌÀÇ screw-in effect¸¦ ºñ±³ÇÏ°íÀÚ ÇÏ´Â °ÍÀÌ´Ù. º» ¿¬±¸¿¡¼­´Â ¿©¼¸ °¡ÁöÀÇ ´Ù¸¥ ´ÏÄÌ-ƼŸ´½ Àüµ¿ ÆÄÀÏ ±â±¸µé, Áï, (SybronEndo, Glendora, CA USA), (VDW GmbH, Munchen, Germany), »èÁ¦´ÉÀÌ Àִ ÷´ÜÀ» °¡Áø °Í°ú »èÁ¦´ÉÀÌ ¾ø´Â ÷´ÜÀ» °¡Áø NRT (Mani Inc., Shioya-gun, Japan), ProFile (Dentsply-Maillefer, Ballaigues, Switzerland), ±×¸®°í ProTaper (Dentsply-Maillefer, Ballaigues, Switzerland)°¡ »ç¿ëµÇ¾ú´Ù. ±â±¸°¡ µ¿ÀÏÇÑ °æ»çµµ¿Í Å©±â¸¦ °¡Áö°Ô Çϱâ À§ÇØ, °¢ ±â±¸´Â °æ»çµµ 0.06, size 20À» ¼±ÅÃÇÏ¿´À¸¸ç, ProTaperÀÇ °æ¿ì¿¡´Â ÀÌ¿Í À¯»çÇÑ S2¸¦ »ç¿ëÇÏ¿´´Ù. °¢ ±â±¸´ç 10°³¾¿ ÃÑ 60°³ÀÇ Åõ¸í·¹Áø ºí·ÏÀÇ ¸ðÁ¶ ´ÜÀÏ ¸¸°î±Ù°ü(REF A0177, Dentsply-Maillefer, Ballaiguez, Switzerland)¿¡¼­, Àüµ¿ÆÄÀÏÀÇ È¸Àü¼Óµµ´Â ºÐ´ç 300ȸÀüÀ¸·Î ÇÏ°í, ´ÜÀÏ pecking µ¿ÀÛÀÌ µÇ°Ô ÇÏ¿© ±â±¸Á¶ÀÛÀ» ÇÏ¿´´Ù. ÀåÄ¡¸¦ °í¾ÈÇÏ¿© ÀÏÁ¤ÇÑ ÈûÀÇ pecking µ¿ÀÛÀ» ÀçÇöÇÏ°í screw-in effectÀÇ ÈûÀ» ÃøÁ¤ÇÏ¿´´Ù. °í¾ÈÇÑ ÀåÄ¡ÀÇ dynamometer°¡ ±Ù°üÇü¼º °úÁ¤µ¿¾È screw-in force¸¦ ÃøÁ¤ÇÏ¿´°í, ±â·ÏµÈ data´Â °í¾ÈµÈ ¼ÒÇÁÆ®¿þ¾î¸¦ ÀÌ¿ëÇÏ¿© ÄÄÇ»ÅÍ¿¡ ÀúÀåµÇ¾ú´Ù. µ¥ÀÌÅÍ´Â one-way ANOVA·Î Åë°è󸮸¦ ÇÏ¿´°í, Tukey¡¯s multiple range test¸¦ »ç¿ëÇÏ¿© 95% ¼öÁØ¿¡¼­ À¯ÀǼºÀ» °ËÁ¤ÇÏ¿´´Ù. ProTaper°¡ °¡Àå Å« screw-in effect¸¦ ³ªÅ¸³»¾ú´Ù(p < 0.001). ´Â ¿Í ProFile º¸´Ù Å« screw-in effect¸¦ ³ªÅ¸³»¾ú´Ù(p < 0.001). ±×·¯³ª , NRT¿Í ProFile »çÀÌ¿¡¼­´Â À¯ÀÇÇÑ Â÷ÀÌ°¡ ³ªÅ¸³ªÁö ¾Ê¾Ò°í(p > 0.05), »èÁ¦´ÉÀÌ Àִ ÷´ÜÀ» °¡Áø NRT¿Í »èÁ¦´ÉÀ» °¡ÁöÁö ¾Ê´Â ÷´ÜÀ» °¡Áø NRT »çÀÌ¿¡µµ À¯ÀÇÇÑ Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù. ÀÌ»óÀÇ ¿¬±¸°á°ú¸¦ ÅëÇØ º¼ ¶§, ½ÇÇè¿¡ »ç¿ëµÈ ¼öÁ¾ÀÇ Ni-Ti Àüµ¿ÆÄÀÏµé »çÀÌ¿¡¼­ screw-in effectÀÇ Â÷ÀÌ°¡ ³ªÅ¸³¯ °ÍÀ¸·Î º¸À̸ç. ƯÈ÷, Ni-Ti Àüµ¿ÆÄÀÏÀÇ radial lands¿Í rake angleÀÌ screw-in effectÀÇ Â÷À̸¦ ³ªÅ¸³¾ ¼ö ÀÖÀ» °ÍÀ¸·Î »ý°¢µÈ´Ù.

Screw-in effect is one of the unintended phenomena that occurs during the root canal preparation with nickel-titanium rotary files. The aim of this study was to compare the screw-in effect among various nickel-titanium rotary file systems. Six different nickel-titanium rotary instruments (ISO 20/.06 taper) were used: (SybronEndo, Glendora, CA, USA), (VDW GmbH, Munchen, Germany), NRT with safe-tip and with active tip (Mani Inc., Shioya-gun, Japan), ProFile (Dentsply-Maillefer, Ballaigues, Switzerland) and ProTaper (Dentsply-Maillefer, Ballaigues, Switzerland). For ProTaper, S2 was selected because it has size 20. Root canal instrumentations were done in sixty simulated single-curved resin root canals with a rotational speed of 300 rpm and single pecking motion. A special device was designed to measure the force of screw-in effect. A dynamometer of the device recorded the screw-in force during simulated canal preparation and the recorded data was stored in a computer with designed software (LCV-USE-VS, Lorenz Messtechnik GmbH, Alfdorf, Germany). The data were subjected to one-way ANOVA and Tukey¡¯s multiple range test for post-hoc test. P value of less than 0.05 was regarded significant. ProTaper produced significantly more screw-in effects than any other instruments in the study (p < 0.001). produced significantly more screw-in effects than , and ProFile (p < 0.001). There was no significant difference among , NRT, and ProFile (p > 0.05), and between NRT with active tip and NRT with safe one neither (p > 0.05). From the result of the present study, it was concluded, therefore, that there seems significant differences of screw-in effect among the tested nickel-titanium rotary instruments. The radial lands and rake angle of nickel-titanium rotary instrument might be the cause of the difference.

Å°¿öµå

´ÏÄÌ-ƼŸ´½ Àüµ¿È­ÀÏ; ¸ðÇü ·¹Áø±Ù°ü
Dynamometer; Nickel-titanium rotary file; Screw-in effect; Simulated resin root canal

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